A21 Analog Interface Board And Eeprom Removal; Tools Required; Procedure - Agilent Technologies E4991A Service Manual

A21 Analog Interface Board and EEPROM Removal

Tools Required

• PLCC extractor
• Torx screwdriver, T15

Procedure

Step 1. Remove the outer cover as described in "Outer Cover Removal".
Step 2. Disconnect the following cables from the A21 Analog Interface board.
• A21 to the A10 Analog Motherboard flat cable (item 3 in Figure 6-2)
• A21 to the A22 Front Panel Keyboard flat cable (item 8 in Figure 6-2 on page 236)
• A21 to the system fan cables
Step 3. Remove a torx screw fastening the A21 to the rear panel.
Step 4. Remove the A21.
Step 5. Remove the EEPROM from the original board, then mount it on the new board. Because,
the adjustment data is stored in the EEPROM. If the EEPROM is defective, it is necessary
to perform all adjustments after replacing it.
Figure 7-6 EEPROM
Chapter 7
A21 Analog Interface Board and EEPROM Removal
Replacement Procedure
299